This unique workbook provides an understandable introduction to the fundamental principles of proton magnetic resonance imaging. Concepts of electricity and magnetism that are central in tissue magnetization and image construction are explained using simple two-dimensional models, many of which can be demonstrated with ordinary magnets, compasses, and iron filings. The reader can thus obtain direct visual answers to questions that students often ask about how the magnetic resonance signal is generated; how its frequency is used to encode position; what phase, phase coherence, and phase encoding mean; how magnetic resonance signals decay and how this decay affects contrast and intensity in the image. The book then progresses to three-dimensional models to explain concepts such as pulse angles and relaxation. Each chapter includes question-and-answer sections.